42919721833 has 2 divisors, whose sum is σ = 42919721834. Its totient is φ = 42919721832.

The previous prime is 42919721809. The next prime is 42919721863. The reversal of 42919721833 is 33812791924.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42899937129 + 19784704 = 207123^2 + 4448^2 .

It is a cyclic number.

It is not a de Polignac number, because 42919721833 - 2²⁹ = 42382850921 is a prime.

It is not a weakly prime, because it can be changed into another prime (42919721863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21459860916 + 21459860917.

It is an arithmetic number, because the mean of its divisors is an integer number (21459860917).

Almost surely, 2^42919721833 is an apocalyptic number.

It is an amenable number.

42919721833 is a deficient number, since it is larger than the sum of its proper divisors (1).

42919721833 is an equidigital number, since it uses as much as digits as its factorization.

42919721833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The spelling of 42919721833 in words is "forty-two billion, nine hundred nineteen million, seven hundred twenty-one thousand, eight hundred thirty-three".